I recently turned on “fast user switching” on the Mac, and just discovered that the login dialog keeps the previous user’s keyboard layout, instead of reverting to the system default. Which is a problem if the previous user uses Dvorak, the new user doesn’t, and the new user is typing in a password so she can’t even see that something’s gone wrong by looking at the characters that appear.

In fact, switching layouts and then switching users doesn’t work, either: it goes back to Dvorak! Weird. Changing to the Finder, then switching layouts, then switching users works.

To be fair, I can see how this sort of usability bug could slip through testing…